The Bancho in the title is Japanese slang for student delinquents The series appears to be a sequel to the earlier SD Gundam Musha Maruden.

At an inter-racial school attended by humans and Mobile Citizens, young Ryuunosuke befriends fellow student Kokuryu.

Eventually a mysterious group emerges, forcing Kokuryu and company to leave simple schoolyard scraps behind and engage in life or death combat.

Similarly, Sekijishi Gundam comes with a makeshift stand for his surfboard which is made from the smallest parts runner and a cardboard wave cut out from the side of the top lid of the box.

Notes on the instruction sheet for Kokuryu's model kit imply Ichishiki based the look on a large quiff, a hairstyle commonly associated with bancho culture in Japan.